I can definitely see the effort with the 3D stuff, but it just doesn't quite land due to the very floaty jumping system - it left me feeling quite frustrated, unfortunately.
The font is a tricky one to read and I'd go with a more common, easy-to-read text, especially if you have lots of words on the screen at once. Some of the artwork seems to have been scaled up but without using 'nearest neighbour' and it leaves the pixels being quite blurry.
The combat looks inspired by other grid-based 16-bit era games and I appreciate you may be a fan of those types of battle systems, so are hoping to emulate that. For me, I just needed a bit more explanation as to what I was doing and some help with controls and what to do etc.
It's impressive you've gone the 3D route and tried something a bit different. I hope you continue making projects and maybe even polish this one up more, if you still have the interest!