I got bored and did a thing. If you miss stuff your laser gets smaller. If you hit stuff your laser gets more powerful. I'm targeting the Pi Zero because having limits is fun. It's a very early version right now so I'm just trying to get the basic mechanics together.
Win32 binary here:
http://pi.pixelfucker.com/spang.zip
Source code is here, should compile on pretty much anything SDL2 is supported on:
https://github.com/SonnyJim/spang