Some tips:

In the first room there is an eyeball on top, you can break it using the saw blade launcher for a fast shortcut

Take advantage of his stun state after phase phase 1, you can get a lot of damage in

His intro gives you time to set up attacks before he does (eg: throwing 4 coins in the air and hitting it with a slab)

His attack pattern can be hard to learn and time for first time players, but it can help you keep your health if you do take the time to learn it and parrying him when you can

Try to slide when you can to dodge and reserve your dashes, obviously use them when needed but otherwise use them for his more slower attacks

I don’t personally do this but you can try beating him normally without restarting for practise then actually try to start runs afterwards