I think I first played something similar in one of the early megamans. I hated it. This one is better since you're not falling, you just have a one-way autoscroll. But I also played something similar in an old nintendo spaceship/aliens game (wish I could remember the game, I loved it otherwise). That was my worst level. Mostly because I'm not coordinated enough for most autoscroll levels. This looked like it could be ok but I failed almost immediately. Again and again and again and again and again and again.........

That said, the concept is good and I presume the other 98% of the game is just as good as the TWO screens I saw. Perhaps if it started with fewer mines for a more gradual ramp-up. I still wouldn't get far but maybe others could play longer.

Edit to add: There's even a SMB3 level that is similar but I rock at that one! Because I can filter the background from my perception and realize that it is actually veerrryyy. .... .... vvveeeerrerrrryyyy . ..... .. ..   sssssssllllllooooooooooowwwwwwwwww.....