Just played it for first time and I got that tutorial bug. at first i thought it was reminding me to build a defense (which I hadn't at the time) but it wouldn't go away.
Went to save after adjusting defense and got kicked from server. which is fine, i was going to stop.
I like it so far. It's a fun enough take on the idea and could get a lot of people playing. I thought the sounds were good, but the music was a bit of a strange hybrid. I'd probably go more orchestral and perhaps a wee bit more inviting in the beginning. You use music to create mood, evoke an atmosphere, or provide feedback to the player as to whats going on. yet the artwork seems to say fun, light, romp in a middle earth forest but the music is end of the world, percolating fever. Maybe that plays more into yet unrevealed story? its a quality track just not one I'd put up front, maybe as the player progresses (every set of levels or so) they hear different music tracks.