[GENERAL] IDEA FOR 2 PLAYER GAME

I am thinking of making a 2 player game (hold your tongue on how blah making one would blah since I already got the concept down and a demo working, surprisingly)

However, I hit a "brick wall" of sorts for what kind of game it should be...

-Ideas that come to mind are:
*Capture the Flag {CTF} (Player with the most flags win)
*King of the Hill {KOTH} (Players stay in an area to accumulate points)
*Collector (Collect as many of an item as possible)
*Tag (Players try to chase one another down, whoever is "it" at the end loses)
*Assult (Players try to kill each other, taking X number of lives to win)
*Shovel (Pretty much like the game Spleef, but renamed)
*Ghost (Like Pac-Man, players take turns in trying to collect X number of points while avoiding the other)
*Labyrinth (Like Maze, players take turns in trying to get the other until a player gets out of the maze X number of times)
-Suggested by Rannith (Steam):
*Maze (Players navigate a maze to reach the end)
-Suggested by Seiromem:
*Kill the Carrier {KTC} (Players try to keep ahold of an item for as long as they can)
*Dodge! (Avoid obstacles as long as possible/try surviving as long as possible)
-Suggested by multiple people:
*Race (Players try to reach an end of a track)

Also thought up some ideas for powerups beside gamemodes;

Ideas for Powerups:
*Speed Boost (Makes the player 2x as fast)
*Speed Down (Makes the player 1/2 as fast)
*Steal (Player has the power to steal from the other if they touch)
*Shine (Like the Power Star from Mario series, stuns the player when the powered player touches them)
*Plus Life (Adds an additional life to the player)
*Bonus Bunny/Animal (If a player can catch it, they get bonus point(s))
*Minion Summon (Allows the player to summon a minion on the map that blocks the opponent's path, but not the summoning's player)
-Suggested by CashmereCat:
*Stun Spark (Shoot a projectile that stuns a player)
*Cross Bomb (Creates a blast within a specified range in both vertical and horizontal directions)
*Inverter (Inverts opponent's controls)
*Poison (If you touch a player, then if they move, they will lose points. this lasts for a specified duration)
*Extra Slot (Creates a new slot for a new item)
*Perma-Speed Boost (Makes the player x1.1 as fast for the rest of the game)
*Down Speed Storm (Makes every other player have x0.5 speed for a specified duration)
-Suggested by Seiromem:
*Shield (Protects you from 1 physical blow)
*Trap (Damages any player who crosses it, even the player who set the trap)
*Swarm (Monsters appear on the map and attacks players)

The game hopefully will include a player select (shouldn't be too hard) and a campaign that, when played, unlocks new characters and maps. This is all the ideas a came up with, most of the power-ups are good ideas (at least I think so) however, I wish to find a gamemode that would be fun and sounds great to play (idk, can't word the second reason quite right)

EDIT: I was thinking of adding a health bar, a slot for players to hold a power up, and instead of sprint (for now) change it to a basic attack (semi-range/close attack). Might make the game interesting. Of course, if I go with a gamemode that would allow for combat, otherwise just make landing hits cause stunning.

Thank you for your time and please leave any ideas you come up with :3 any are helpful <3

*NEW* Powerups (Powerups I have thought of/inspired from other games)
*Lightning Shrink (Opponents get shrunk for a span of time and can be stepped to take points/health away/stun them. Shrunk players can not pick up items or capture flags, also dropping any flag they are carrying)
*Teleport (Moves you to a random location on the map)
*Fly (Allows you to go over pits)
*Meteor (A Meteor lands randomly on the map, changing the field for a short time w/ damage to nearby players)
*Bag'O'Points (The player who is carrying this generates points, like KTC, however, the player can't pick up items or capture a flag unless they use it to get a sum of points. The longer held the more points obtained when used. Players can grab this to earn points and when used the sum of points is collective)
*Giant (Like Lightning Shrink but inverse, player becomes huge for a span of time and other players can be stepped on, causing numerous effects. Giant player can not capture flags or p/u items)

NOTE: I changed this to general since these ideas can be applied to pretty much any platform and can be useful none-the-less!