Super cool concept! I always love seeing games inspired by Downwell, but with their own unique spin. ❤️
I'm not totally sure how it fits the jam theme, but maybe the "chain reaction" part kicks in after level 8. That's my record so far after 3 runs.
As I understand it, the game uses procedural level generation. That definitely adds replayability, but at the same time, the first 5 or 6 levels felt pretty much identical to me. I was actually about to drop the game right when I picked up an upgrade! Those definitely need to show up earlier.
If you add more visual variety so levels don't feel so repetitive, this could be a really amazing game! Also, just be careful with the procedural generation. On my last run, the red pixels were almost completely covering the white exit.