Thank you!
Seems I need to look into cleaning up how I handle the mouse and reticule overall judging by the feedback I'm getting!
Yes, that is the intended behaviour, but only for now. It feels a bit forced and unnatural I agree.
I am planning to go more of a metroidvania route later, but wish to make the main gameplay loop as solid as possible first.
Which means for now just returning to the shop between waves.
As for performance, the biggest draw is lumen which can be disabled in the options. :)