This game is quite fun so far, but I think I've found a couple of frustrating bugs.
First, I can't level Luk past its base of zero. It has a listed price, but clicking the button does nothing. The only increases are coming from Jack of All Trades and my equipped belt.
Second, the Dolphin Blessing skill has no cooldown listed in its description in the Skills menu and has no display in the bottom-right skills panel. It also overwrites itself before the duration elapses at ranks 5 and up, which might not be a bug but does make it consume MP prohibitively quickly at high ranks.