I only played the web build, at least what I could play of it, but I was pretty impressed what was on offer here. The web build definitely suffers from load times and hitches here and there, as stated, but was playable... for the most part. I definitely had to reload the page and restart the game at least twice though. Other than that though, everything here on offer is very well done, the sprite work is great, the Wizard of Oz theme is pretty fun, and I think the overall gameplay experience is spot on for bein' a Pokemon clone.
I'm pretty sure you already know, but in terms of 'bugs' I've found they were really only related to the selection of options during battle. Specifically the greyed out options don't lead anywhere (Items and Switch when you have nothing in the bag or extra Hokum-mons) and you can't esc back to selecting anything else causing the game to just 'freeze' and needing a restart.
The only other bug I was able to find was that all the moves (probably only Toto's Scratch, since that was the one I noticed) don't get restocked when going to the clinic, maybe there's another place to go or need an item, but the same thing happens when selecting Scratch when it had 0 left causing the game to 'freeze'.
In conclusion, a pretty great game that offers pretty much exactly what you'd expect from a Pokemon clone with a wizard-y twist... even with the Web build problems stated.