Firstly: It took me way too long to figure out what to do in the beginning... I didn't realize you needed to pick up the sack(its so small and there's no prompt to pick it up..).
Secondly: The games pacing seems really slow to me... I got bored riding the boat down the river.
Lastly: The "click to attack" hint stays onscreen the whole time... Not sure if that is intended... And I noticed that sometimes I would click and it didn't attack.
It looks like you put substantial effort into this, and with some more polish it could be a lot better.