Everyone wants to be birb right? :D
I agree with the pacing stuff. I could definitely made work better with more time, I just got the game somewhat working in the last minute hah.
The spawns (the glowing light blue icons) appear randomly on destroyed blocks, so I cant exactly manage how many spawn you get, but I definitely would like to make them less random. The spawn activate sequentially staring with the spawner you uncovered first, I did make it so they activate slower the more enemies are alive, but it did not have time to properly tune it.