A bit tricky at first since things aren't really labeled. The good thing about this game is that it's easy to tinker with setups and you're not really penalized for it, so that's a good thing (though toggling on and off the lights to get it to work did slow things down).
The beginning is a bit slow as the upgrades are rather expensive, but once you get mirrors it's GG. Piling on mirrors, especially chaining them in a diagonal formation will hit e300 in no time. It's actually a bit unfortunate the game goes by so quick at the end. The mirrors and setting up formations was super fun. But I was only in that mirror mode for a couple minutes before I had unlimited money.
I think you have a solid idea here. Smoothing out the balance will go a long way. There's a lot of optimization and playing around to be had with just laser length upgrades and mirrors, so the foundation is good.