Been a while since your last Key cover!
Not bad! I really like how you doubled your voice at different points, sounds fantastic. You should use that more often in your covers!
You lose a couple of points at moments for being slightly off timing, like at around 0:22 you’re a bit too fast, and lagging behind a tiny bit at around 3:23 onward. But overall, you’re pretty consistent. All this takes is a little more careful editing. The actual quality of your singing is pretty spot on!
Good job Suika! If you want some free publicity, I’d recommend publishing it to Steam and tagging CLANNAD as the game! I’ll also include this as the first fanwork contribution to the CLANNAD Bookclub~!