I do have some questions for you.
Do you think the game is to a point where steam users would pay for it? (Please be very honest about this because it helps me decide what actions to take next. You wont hurt my feelings) For some context the final game would have 10 chapters. This current build would act as a demo.
Do you have any complaints with the SFX of the abilities? If so please let me know the worst offenders.
Does the art of the combat feel disjointed, with the hand painted backgrounds and vector art spaceships?
The color of the shield changes based on its HP. Is this visible? (If not I might have to add more visual indicators. )
Did you try reverse tank controls? Are you generally satisfied with the movement in the game?