This has got to be one of the most polished games I've seen in the jam, especially the UI, that is some AAA quality UI designs and animations there. The gameplay is simple but sometimes I find it hard to tell what is going on on screen, especially bullets just come from every direction and you are spam clicking to pray that hakkero hits the bullet you want. Aside from that I do like the concept despite it could use some work.
Also the art and music speaks for itself. While I do not mind the mix of styles for the art, the music style is consistent and just really catchy in a good way. (Also first stage sounds very terraria like.) Please tell me where is the OST if you have released it somewhere.
Also one note, extra stage is a bit bugged at the moment and I do look forward to play it to the fullest. Your warnings can't stop me from experiencing pain.