It's clear to see that there's quite a lot of work already put into this game, and it a good bunch of features covered. I think it's suffering a bit from going 3D and having such high production value on the character models and VFX. They're amazing to look at, but make the rest of the game feel a bit flat by contrast, and make it feel like the combat should be more extensive than it already is. The most relevant feedback I have for a jam setting is to scope appropriately to end with something mostly cohesive and balanced in terms of all the parts coming together in a way that can be polished (I know I didn't for like 3 times in a row).
That said, I'm glad to see your submission, because now you're on my radar. Those models, the designs, the style, is sauced all the way up and I am so here for it. Brings to mind Platinum's Mad World in the color selection. I look forward to any future developments! Seeing this taggable characters pulled off as actual MetroidVania powerups would be hella exciting.