For a 4 dollar eshop game I think Sonic Blast is not that bad, I don't even think it was that bad for a handheld platformer of the time; the controls are a bit chunky and the camera is REALLY zoomed in, but it's a pretty average platformer, only held back by not being as good as better Sonic games on the same system.

I enjoyed the game, Zone 4 Blue Marine, that level was trash (like the worst Ecco the Dolphin level with sluggish controls and a really zoomed in camera), but besides that the levels are all pretty breezy and some of the bosses are pretty fun.

It's fine, good for a quick 40 minute playthrough.