I had originally planned on upgrades, but I didn't really have much time. I have an empty "powerups" folder in the game files, lol. Maybe I'll add them after the jam; I still want to somewhat keep the base feel of the game that was there with the original submission.
For the enemy thing, that's quite odd. The way I set up enemy AI is that they just spawn every 1-3 seconds and immediately chase the player (with some minor tweaks to avoid overcrowding) though. There shouldn't be any issues with having to find enemies since they'll look for you. If possible, can you provide more details? Also, thank you for playing my game!