Too random, and missing several important things.
Let's go over the downsides here:
1: You're treating using the escape wings as a NORMAL gameplay mechanism. They should be an emergency mechanism.
1a: When you use the wings, you should not lose EVERYTHING you have! I liked my gear, thank you.
1b: When you use the wings, you most especially should NOT lose your FREAKING MAGIC SPELLS!
2: Potions are TOO EXPENSIVE. Fuck this "Rougelikes should be hard" nonsense, I come to play a game to have fun, not be frustrated.
2a: Going up to more powerful potions should be MORE cost-efficient than buying a ton of lesser potions, NOT LESS! Quick math for the impaired:
Regular Potion Cost: 350!!!(WTF), heals 100.
Super Potion cost: 1,200(OMGG!), heals 300.
350 x 3 = 1,050, a savings of 150 gold over using a Super Potion.
You fail at modern gameplay design. Correct these flaws, make it more fun, and it'll be an awesome game. As it is, it's too flawed, too defective.