Thanks for playing and for your kind and pointed comments.
Sound level was normalized (and the monster tutorial line was changed after that)
I agree that we needed a hiding sound both for the action itself and for being hidden (something like a heartbeat, maybe, to remdind you that you're in a hiding/shooting mode)
Expanding this concept will be my main project from now on (after I finish a quick redo of SLIDER). I have two possible paths and I may just split it and do both (an endless runner and a turn based "card" game). Either/both will move away from the one-button control scheme. Stay tuned!