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Well done for putting out your game and being open to criticism. I know how nerve wracking that can be, especially when the game doesn't feel 'ready'. I hope this feedback helps.
The movement controls felt responsive and I liked that I could move the screen slightly up or down with the up/down arrow keys.
The "Z" key froze my game every time I tried to interact with the NPC
(I don't like breaking a game… unintentionally)
I didn't need to use any of my tools, nor was there any incentive to learn HOW to do it. Also, the tool menu doesn't give any visual cue's telling us which tools/items we have or don't have.
Personally, I'd prefer to hold down the jump button to stay afloat instead of mashing it, especially if there's going to be extended water areas later on. that could just be me though.
Finally, I appreciated the frequent checkpoints that minimised backtracking
Good luck :)
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And the game instantly failed before it had even loaded by being in a window inside a window which generally means the game is hosted elsewhere.