Thanks a ton for checking out my game and leaving constructive feedback!
I think you're on point with them spikes (all your comments really). A lot of things could probably improve the spikes but having the extra black where they attach is jarring for sure!
The background (star field I guess) was a late add I struggled with. I settled on motion to try and distinguish it from the foreground. Still images were not working out for me. I need to develop a better eye for color, graphics design, etc. You can barely read the game name in my banner screenshot for example... oops.
Games have so many aspects to consider!
Thanks again!