The game is really fun! its incredible how fast things escalate. I love how at the end there's just so many enemies the game can't even handle it on the web version. I also liked the alternative paths offering you an upgrade if you choose to go for them since they're longer (though i do think it would make more sense for them to give upgrades each loop, but be even more dangerous)
I do wish the enemies were a bit slower and less plentiful but stronger so that you had to actually strategize - like maybe having to drive around enemies or try to shoot them with your gun - because right now you can just keep driving and tank all the hits since they die to being run over anyway, and you can't outspeed them without putting a lot of uprgades into speed.
Other than that, i would love to see upgrades stacking differently, like i think the bomb upgrade feels very similar to the shooting so i think it should benefit from upgrades that buff the shooting, and maybe the bumper and the razors could benefit from speed upgrades.