Any way to cheat the beat the fox with the sword?
Any tips to beat the mushroom and the fox boss guys?
For both Boss fights, try to wait until they begin their "Second Phase" animation to use your healing items, that helps quite a bit. Walking to the far corner of the room usually buys you enough time to heal, too.
Mushroom bitch can be dodge rolled through, but you have to pre-emptively start the dodge to get it to work; it doesn't work at the start of it's frames, for whatever damn reason. Basically, avoid Mushna when she does her retarded run, and spam attack on her as she lands her hops. For the second phase, you can go ham on her for a bit when she fires off her baby canon. You'll get slowed, but it's not like your going to get much room dodge her even at full speed. Feels like there's a bit of luck involved with fight, because she never really stops moving after the second phase. Generally speaking, don't take your hand off the Sprint button either, and if she runs towards you and there's no time to roll through, try a sprinting jump.
For the older fox girl first phase, just take a few steps back from her (out of her sword reach), then whip, and repeat. She'll never really quite catch up to you. Second phase works best if you can get her on the hill to the right, so that her sprite is slightly above. For some reason, even though she aims down with her sword, the beam doesn't connect to you. Also, if you see her facing one direction and start any kind of animation, try to get behind her, and the beam will fire away from you. If you get the parasol mushroom and she aims a beam at you in a way that you can't avoid it, doing a jump and gliding behind her usually dodges the attack.
If you can get the older fox girl against the left wall in either Phase, she tends to get stuck for a while, because it seems the AI instinctively tries to back away from you, but then gets blocked by the wall. Overall, she was way easier than Mushna. Beating her gives you nothing though. The achievement your supposed to get from it doesn't even pop. I tried beating her multiple times, but nothing. That's just the end of the current version, as far as I know.