This is an amazing idea, the simplicity in art and gameplay gives it a nice feel while having decently complicated puzzles while also clearly still having crazy potential, my only issue was a few glitches like my ball coming out the wrong side of the portal and no clipping thru walls and out of camera view, and occainsonal shading errors most of these can be easily overlooked. The only suggestion id have would have been to make the small ball a little easier to see(contrasting collars, harsher outline etc.).
Really good job :), u should be very proud