Cool game with good aesthetics. The rewind mechanics is nice. My plane seems to be too big but the hit box is smaller because the projectiles are just passing through the wings. The enemy projectiles are too many or the fire rate is too fast, I cannot get rid of the planes at the lower part due to projectiles blocking the way.
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Yep, your hitbox for taking damage only includes the center bit, not the wings; however your hitbox for collection does include your wings. This is intended to skew advantage to the player, but i can see how it can be a tad confusing. Also protip: your plane can fire at an angle; notice how your plane turns when moving. If you get into a situation where there are too many enemies in a certain part of the screen, you don't actually have to move in front of them to clear them. Try holding a direction key and tapping the fire button when your aiming laser is on top of enemies, then holding the opposite direction before you get too close.