I tried 10 times and I only managed to get an attack out once...I still don't know what to do, I tried charging the attack at different levels depending on the tree size, launching a weak attack with E... no matter what I did it was always time to rest. Also, the long GameOver sequence discouraged me from playing more, I was spending more time in the GameOver screen than in the game itself.
The tutorial is very confusing, with many concepts that make no sense to a new player, I don't understand why it's time to rest or why would I gain more time by cutting down trees? I read it several times but I couldn't wrap my head around what I'm supposed to do and what it all means.
You should put an arrow or, better yet, a scroll bar in the tutorial because nothing hints at there being more info below. And put buttons or make the scrollwheel work, even after seeing your message saying there was more info below it took me a while to discover that I had to grab and pull the text.
You also need a button to close the game. I had to Alt+F4 out of it because I couldn't find a "clean" way to quit.
The sprites and art are very good and the music is very catchy :)