Nice job on conquering lunatic mode! You're one of the small amount of people that actually did it :P Refering to the dash grace, it's actually there, your collider enables 0.2s after the dash ends :) Probably making it a tiny weeny bit longer wouldn't hurt, thanks for the feedback!
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Oh, I was referring to a small grace period after getting hit. As in, a bullet hits you, then you have a small amount of time to dash and avoid the hit. Touhou for example implements this, where you can use a bomb very shortly after getting hit and avoid losing a live. I think it’d be a nice addition besides the post-dash grace period :)