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My take on Prototype 4 with all five bonus features implemented, plus some extras.

• Varied enemies — every enemy spawns at a random size; bigger ones are heavier and hit harder.
• Tougher enemy type — a faster, heavier red enemy that's randomly mixed into each wave.
• Homing rockets — a powerup that fires a guided rocket at every enemy on the field (left mouse).
• Smash attack — a powerup that hops the player into the air and slams down, blasting nearby enemies away; the closer they are, the farther they fly (Space).
• Boss battle — every 3rd wave "The Master" appears: a huge, heavy, glowing boss that steers agilely to cut you off and fires projectiles at you on a timer.

Extras: powerups stack and run on independent timers (grab all three at once), an on-screen HUD shows the wave number, a boss-wave alert and a live countdown bar per active powerup, and falling off the platform brings up a Game Over screen with a Restart button.

Built in Unity 6 with the new Input System.

Bonus Features 4 - Share your Work

Sumo Arena — all 5 bonus features + stacking powerups