Great little game with lovely retro-3D graphics, a fun story, and a super catchy and groovy soundtrack! I absolutely adored the designs of the main character and the ghosts, and the main song playing in the level fit the spooky-cute atmosphere really well.
The controls felt a bit floaty at first, but it all clicked after getting the catalyst; spamming explosions in mid-air to reach sonic speeds was really satisfying. Jumping off climbing vines was a bit awkward at times, and the momentum from the down-blast felt a bit wimpy compared to the sideways shots - although the extra air time and damage capability definitely came in handy during the boss!
The level felt a bit empty and repetitive at times, and it looked like there was a lot more interesting stuff going on in the background than the actual level. On the other hand, it left more room for the aforementioned explosion spam! As far as I was able to tell, some of the pickups hidden throughout the level were health upgrades, while others were simply there to provide flavor text. It was a bit hard to tell the difference between the two, and I missed out on the text a couple times due to moving away too soon.
The final boss looked cool and gave me some trouble, though eventually, I figured out I could beat him easily by standing next to the door and down-blasting him as he passed under me. This made the fight a lot easier, since most of his summoned minions were too far to aggro on me.
Overall, an excellent game that can get even better with more enemy variety and more stuff to do in the level. Great job!