Ok, I definitely can't pass trough the 4th level (I think I'm right, it's the 4th level, with the pillar between the red spades).
Honestly, it's not that bas or buggy as you said, and even though you pretend it's a " poorly designed very buggy beta", I believe you sriously have put a lot of love in your game, even tough it is not perfect (and it's still a beta).
I have only noticed two bugs : The first one is with the animations. When you die and you haven't double jumped yet, you can still see the jump anim if you press space, and when you restart the level after death, the skeledog jumps even though you haven't pressed anything (I think it's due to the last time I pressed space during the death anim timer before respawn)
The second one is not really a bug, but a problem in your level design, I think. In the 4th level, I presume you're supposed to jump on the pillar surronded by those red spades to go farther and get the key to the next level, but your skeledog doesn't jump high enough to climb it, so you either end up impaled, waiting in a horribly painful agony for a death that will never come again ; or, your just simply go back and retry, but it doesn't work. For me, it didn't work, but I don't know, maybe you managed to pass, but I couldn't...
Another problem, is about the camera. Your skeledog (Yeah, I know it's a dragon, fine, I got it >:( )... Anyway, your character runs and jumps really fast, even too fast for what the camera has to display. The camera is centered on and is too close to you, and its field of view is really narrow. You can barely see the next platform even if it's close to you, and when you jump, you never know if you're going to reach a platform of fall straight in hell without any warning. Trust me, it's really handiccaping, like in the 3rd level for example, even though this game is pretty easy.
About that, now I'm thinking about it, the keys are truly too easy to get. For example, the second level can be finished in only 2 jumps. And the 3rd level can be finished even if you don't have explored all of its areas (and your troll zone :'( ) You should have at least extend your levels' lifespan to implement a lot more of difficulties, gameplay, maybe puzzles, etc... I know it's just a beta, but come on, I know you can do it. You managed to animate the skeledod's tail dynamically, and it works perfectly fine ; I'm sure you can do it.
Well, I think that's all for the moment. It's too bad you can only write one comment per game. You cannot rate properly a game in development like this, but I suppose it's meant this way to force people to let good reviews instead of wasting their only comment for trash. Anyway, I'm very interested in your game, maybe you could add a short cutscene explaining the story (if any) ? That would be great too.