This game surprised me. It seemed a bit disjointed at first with a lot of different things going on, but once it got going I really enjoyed some of the mechanics. It's a simple premise that's well-executed, and it feels like playing an old forgotten classic from some obscure console.
The arcade/NES/Atari display options are very cool. I also really like the sound design: music and SFX are excellent, and the pitch increase on footsteps as you climb up higher is a nice touch.
I found a few bugs / issues, most of which should be pretty easy to fix (a couple were mentioned by fricochet already):
1. It's possible to cheat by walking flowers to the left side of the screen at ground level (without climbing the ladders).
2. You can't bite the boxes while holding a flower, so it's possible to get stuck behind a stack on the ground and not be able to move. I would recommend allowing the player to bite while holding flowers, or maybe add a jump ability to get over the boxes.
3. After you get a game over, restarting the game does not reset the score or lives. You start again at level 1 with the previous score and 0 lives. Closing and re-opening the game appears to be the only way to reset it properly.
4. When you get a high score, 2 entries are added with the same number to the scoreboard (one with the initials the player entered, and another with initials "ABC").
5. I feel like the TNT hitbox lasts a bit too long. I died a few times walking into the TNT zone after I thought the explosion was over. Maybe use a longer sound effect if you want it to be lethal for several seconds.
Like I said, nothing extreme here and hopefully they can be fixed easily. Great job!
