Really cool idea, pretty fun. It can use more things, like more upgrades and such. I feel this game were more fleshout it can be great game. The art is good and I really like the sound effects. The bug of refresh rate really needs to be fixed, but in a way, gives a bit more challenging, maybe if you guys decide to continue working on it, maybe try to design a challenged/upgrade based on it. Like 144hz is pretty impossible, 75hz is hard and fun.
Overall cool game, good potential