Not being fullscreen you mean cause of the UI?
Also it might just feel weird cause its on 4d sphere but not sure.
I will make it if you're willing to pay, not sure what do you mean by reaction matrix because particles are dont have colliders and are simply points in the simulation, currently particle size is for visual purpuses only I could use that for colliders but just asking for clarity.
It might take some time as I am currently focusing on project for #SoME3 making a video about 4D rotations, that will take me around 2 more weeks to make. I'll need around a month to do it.
I could send you the results as videos of the features, then you pay and I'll make it public if that's fine.
Fun to play I loved the shotgun, got stuck when got to the left part of the second level idk if im missing something, also with the movement i suggest leaving some space for jumping where it doesnt do continous move turn, got a little motion sick from the small turns when jumping.
Overall it was a good expirience. Reminded of the name of my game when I saw it.