The shooting mechanic is kind of unclear at first. The laser would normally imply you just hold the button down. I'd change the appearance of the weapon or change the mechanic so it feels a little more like a laser.
The gameplay itself (shoot 100% of the obstacles in the tunnel) isn't much fun, honestly. You could let the players miss at least a couple.
While the graphics are rough, they're mostly fine. The player ship could use a fix-up. Good choice on the sound front though.
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