Hey TimBer!! Fantastic entry :)! It looks amazing and is very polished!
I wish there was a reason for me to move the core around in the early game, perhaps something to collect? The enemies are nicely done, though some unique movement pattern would really put a spin on them! I feel like a way to deal AoE with the core (with some item maybe?) could also be interesting.
Suggestions aside, I really enjoyed this one, thanks :)!