You're definitely right about the pacing issue. In the future, items will be unlocked gradually by collecting currency or finding items in the singleplayer campaign. For the purposes of the demo, everything is automatically unlocked for testing purposes.
Melee weapons are a bit overtuned right now. They've always been weak in pvp, so I've been buffing them bit by bit. Might consider weapons having different stats between single and multiplayer modes.
There's only one bow weapon in the game (love bow) and I'm not sure what you mean by disintegrating. Its a charge weapon and doesn't fire very far if uncharged. Also, the projectile is a little hard to see right now, so maybe that's what happened? Also, the projectile can hit allies to heal them, so if you had a summon maybe the projectiles were disappearing when hitting it?
Thanks for playing and giving feedback!