Overall a decent entry for Metroidvania month jam. Nice use of mechanics for power ups. Pleasant graphics and audio.
Only major gripe is the background and foreground are hard to tell apart, I kept walking into walls which I could barely see. The damaging goop also barely stood out and kept hurting me before I realised what I was walking into.
I will admit I am on a laptop with a low brightness screen, but the foregrounds and background elements could do with a little more contrast to better tell them apart. And the damaging goop really needs to stand out, maybe a brighter purple/pink, something that screams 'danger'.
Otherwise the background environments are nicely put together, relatively simple but good enough for a jam game, and is certainly an improvement from Meteora your previous submission. It could do with more landmarks and unique environmental details to make key rooms pop, but I respect what was done in a month.
As for level layout it feels fairly fluid, most of the upgrades and room pathing seemed to flow leading you along a natural path. And even when that path broke it wasn't hard to find a way to the next powerup thanks to how everything seems to connect in multiple ways. Overall I never felt lost which is certainly a sign of good level design. A few rooms were on the tricky side in regards to platforming but the rest was smooth.