I picked this game up during the quarantine sale, and finally got around to playing this game, and I regret not playing it sooner.
Minor Spoilers
Super Skelemania is a short and sweet metroidvania. A fun adventure, and while not perfect, definitely worth your time. I really liked the soundtrack, and how smooth the animation is.
However, it does have its flaws. The worlds, while large, are barren, making it feel more like a jungle gym than a set of platforming challenges to reach a reward. Each world can pretty much be summed up with: find the map, find the ability, and find the gong. This game's groundpound also suffers in the sense that it isn't really used much aside from getting that one gong in the mines/jungle (I'm sorry, I'm bad with names). At the very end, it is unclear what to do with the final powerup, so I would personally suggest adding an arrow or an escape sequence a la Super Metroid.
Strangely enough, what I really had fun with was messing with the movement. You can gain crazy speed with jump canceling a dive from a short jump whilst running, and climb up ladders lightning fast and skip sections with a height boost by mash backflip on ladders. This made traversing through the worlds really fun as I blazed through everything. Heck, you can even kill the boss by only dashing and jumping as a nice challenge. I'm fairly certain that none of these were intentional, but it just was so fun!
Super Skelemania was a great experience. I found one or two visual glitches along the way, but nothing major. It took me about 2 hours to complete, as I (embarassingly) did not realise I could drop through platforms whilst headrolling. Overall, a great improvent over the original, and a game I can recommend to my metroidvania friends. 5/5
(For the dev: A small nitpick would be the (Keyboard) controls, as you can't jump in mud with backflip(C). I would personally move head roll to X+DwnArr, groundpound to Z/C+DwnArr, and rocket blast to Z/C=UpArr.)