This game makes me sad.
Because it's SOOO good! Feels really fun to play, simple idea that just grabs you as a player and makes you want to play. But I don't think it meets the limitation of the player being on a timer; of course timer's must be in the infrastructure of the game for things like spawning enemies and collectibles, but I don't think that meets the limitation in itself.
And also, I've had 3 or 4 game crashes in wave 4 now; if you make a big push with a full boost through lots of enemies, Unity seems to struggle to keep up and I just get a freeze and then a 'this page isn't responding' before an X face. :(
I'd love to see this game be developed to fix the freeze, because even if it doesn't fit the limitation of the timer it's so fun!