3x10 is hard to compose puzzles for. You might find it useful to look at the hardest puzzles in this restriction and see if they inspire you:
Insular Dwarfism, Swan Song, Typhus Fever Shananagans, Vanilla Extract, Vanilla Extract II
Nice optimizations, cool structure.
It would be better to remove unnecessary parts of the level – levels tend to get better when you make them smaller and simplify them.