Starts quite difficult(which I don't think is bad) but gets way too easy. Since you get 3 upgradepoints for a 3 shuriken rating after the frist boss I had maxed power and evasion before the second. The 5 points for the last levels are way too much. The Moment you have attack evasion and health maxed nothing can stop you. Health isn't even necessary in my opinion. I don't know the usage of speed(even though I had it max) but the scroll damage and weapon durability are too much of a gamble unless we get a way to increase drops. The second boss also needs an upgrade. It's basicly the first one with new skin.
It was a fun and short game but gets very repetitive. Nonetheless i rate it 4/5. If it was longer without added variety in combat I would rate it lower but with its length it is ok I guess.