Hey! i didnt get the game machanics. i only spamming the space and can only buy one upgrade per round. But the game looks and feel funny and sound is nice to!
That's it, you got it! You press the space bar to attack the enemies and can trade the defeated ones for upgrades.
The lack of upgrade choice was because I was afraid I wouldn't be able to implement more in time.
Thanks for giving it a try!