Hi, Thanks for the feedback!
Most of the stuff you mentioned is still a work in progress so there will be major improvements hopefully in the future. The default units in the game is currently in metric (kmh and meters), The pipeline for different measurement units is currently being worked on and I didn't include it in the latest build due to time constraints.
Hopefully by the time the next update hits I'll include countermeasures for the player. And hopefully I'll bring out a small update to address the difficulty and enemy flaring issue.
Hopefully I can bring the next update sooner than the gap between this demo and the previous one. Look forward to it!