At least, there is no time skip found yet so you will have to play this level till it ends. Just survive the rockets. It's easier than it looks like. You will start this battle with full health, so don't waste time before, collecting the tasty cheese.

1. The bombs on upside have random spawns and timings, while the bombs at downside are scripted. Learn them and you will lose max 1 HP on this.

2. There is a glitch to move into the Dogs body and jump downside to the last area. Bombs will fly there, but they don't hurt you. You can skip the whole upside part to stay guaranted alive. But a tough jump is needed to achieve this. You can short-jump into the right "Hill" at the first bomb spot. At 2/3 the height of the hill (a bit higher) you have to land to move into the body. Also, this saves a few frames, since you can stand on the right side a bit earlier, than you would if you jump from topside.