For this to work you need to download both the .exe (for Windows) or the .x86_64 (for Linux), and the .pck file (listed as the linux download), put them in the same folder and run it. I.e. both the 35MB file and the 209MB file.
I think you might have been a bit too ambitious here. There's a lot of ideas at play and a lot of complex mechanics/systems attempted, but none of them really works in isolation and don't make sense together either. There's a lot of technical skill here, you've been very productive! I just think you should limit the scope a lot, find one or two core mechanics and focus on them! This game didn't know if it wanted to be an fantasy brawler, a shooter, a platformer or a puzzle game, so it tried to be all at once, and that's impossible to pull off for a small/solo team even if you had months to develop it.