Short and sweet action-packed game! Love me a good boss fight and this cut to the chase with some decent patterns to fight through and great expressive animations. Wish there was another pattern to contend with but I liked what I got. Started off hard but I liked the challenge and got it down no problem eventually. There was a bit of an exploit with slimes in that if you don't kill any, they stop spawning at two on screen: not sure if that was intentional or not.
While I enjoyed myself, it took me a bit to get used to at first: I didn't even realize there were bounce pads on the sides (for some reason I thought the cogs would hurt me if I got close to the sides so I barely looked over there, and I figured the upper level was just for the slimes to jump in from) and the fact that you don't change direction when holding down fire was good, but confusing initially. Also I don't know what the combo counter at the bottom was? It felt like I was getting life back when I reached a certain combo, but the number felt random and sometimes wouldn't even happen despite going into triple digits (or it would happen when I had full life which wasted it). Would help if that was a bit more intuitive, maybe it should say something like 25/90 or it should just be a bar filling up with a health/plus symbol on it to show its purpose more intuitively.