Hey Thank you for the comment - I value your feedback a lot.
What you said was correct, I made some mistakes with collisions (where some of them have colliders, some are traps, some doesn't have colliders at all.) I need to fix them in the next update. Rotating the tank while holding location & keep the camera + turret steady when tank body moves sounds like a cool new idea to try out - I will try testing it asap.
There will be more enemies - specially troops that give the 'enemy waves' feeling.
Also the roguelike - updates are also on the way.
I published this as an early build - so people can play (and I can get feedback from players like you) and I can continue development slowly - build a little community around the game, etc. thank you again for the suggestions and feedback.