Another few ideas:
- (Optionally) implement the field-of-view you had in your first Chronosphere game, to make it more difficult
- Let enemies also respond after you hit them, but before they saw you. You now can sometimes kill them with multiple bullets, without them moving.
- Upgrades, either temporary, or lasting
OMG so many ideas are popping up now:
- Combined with the field of view, you could have a radar upgrade to ease it up a little
As a hobby I used to spend some time every now and then to work on my Java game. Ideas kept popping up and I just implemented them for fun. Never meant to release it though, just as a hobby. It was also a top-down kinda game with different weapons, different enemies with different behaviours and movement patterns. Hence the idea surge ;-)