spend like 30 min on your game and bought all the upgrades, I really liked it ! my only complaint would be on the balancing, i woud be great if the enemies would still be somewhat of menace mid and end game. maybe by upgrading their stats too each game or something. But I also appreciate the feeling of being overpowered so... yeah... idk. Could be also fun to make them spawn more and more of them to make the game more chaotic.