You'll die more in this game than the other Ben 10s because it's a mostly a runner and not a standard brawler/platformer. You can unlock shortcuts to help you out though and any rooms you cleared out stay cleared unless you restart the level. It's still not very tough to 1,000 out though, I gave it a 3 on the roadmap. This game isn't worth buying but it's a good rental.
There's only 1 real boss at the end of the game and he's easy. For the other levels, you'll have a bunch of enemies thrown at you at the end, but there's nothing too bad. I think using the Medium class and spamming projectiles is the best way to go.