Thank you for playing!
Yeaah the arena is a bit too big and its easy to just fly about avoiding enemies but I will fix that in the next update so stay tuned >:)
As for the rotation, get the gyro booster perk or a faster ship! Each ship has different turn rates and there is a bunch to unlock (or click the unlock all button to get all but the final model). The idea is that slow turning ships should be built with autocannons and the ballistics chip so you can obliterate enemies without having to turn to them
There is another trick, you can rotate faster by right mouse clicking for fine aim and using Q or E correctly to effectively double your gyro towards a direction
When I get off work I'll definitely give your game a shot and thanks for mentioning this is practically for steam, I hope to get there with this once it's up to standard
Have a great day!