Wow! First, let me thank you for the lengthy feedback! I really appreciate it!
For difficulty cap, I have some new mechanics in the works that I haven't had the chance to implement yet but I think it would increase the challenging factor. No spoilers for now xdd
I like the idea of having multiple coloured lasers. One of the future mechanics would be colour addition when crossing different coloured beams together to form a new colour.
The idea of remotely controlling a laser is interesting, and I might experiment with different controlling methods. Interesting suggestion of removing one additional input for firing lasers, I'll play around with it :D
Thanks for your constructive feedback!