Thanks, appreciate that! I'll look into fixing it the next time we update.
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Glad it worked out well for you all! :) Due to our Engine (C# and XNA) it was fairly straight forward to get running as there are some really nice ports (FNA and MonoGame along with Mono for the C#).
Hmm, yeah this is definitely odd! You could give the OpenGL version a shot as it uses a different engine internally (SDL2 and FNA). I'm not sure what would be causing this with the XNA version though.
We're looking into making an official level editor in the future, but I don't think we'll ever have official mod support. That said, I know a number of people are looking into doing game modding themselves.
The Itch version is identical to the Steam version, just minus the Steam DRM and Achievements.
An alternative thing to try is the OpenGL branch - I've heard some people just have better luck with it than the XNA one. Sorry it's been giving you troubles :(
Yes, the latest version up on itch should now remove freeze-frames with the green refill gems.
The 60fps is on purpose - we lock the framerate so that the game stays deterministic for every playthrough.
Not sure about the CPU core stuff - the game doesn't really do any threading except when loading content.