I like how you implement the theme into you're game, because I think it has a lot of potential.
Now lets get to the important part (this is just my feeling and noted that I only got to the second hot metal) :
1. I feel like the controls are really annoying, the jump sometime doesn't go very high and controlling when to get left right is very hard. (The physics also felt a bit janky but its not that important)
2. The sound effect is quite annoying. I wish there would be a setting maybe or you could say I can just mute the entire game but the point is I feel like you could get way better sound effects. For example the music sound like a kid song(sorry) and the bounce effect sound very cheap.
3. I did said I really like the how the mechanic fits the theme, but I felt like it is quite annoying that the splash you make revealing the obstacle fade away so quick, since I won't be able to see the hammer and need to die, and it is really hard to see the hot metal thing.
4. I like how you don't immediately teleport the player back so the player get time to see what they die to, but maybe it just me but it is quite annoying when the big tomato stay at my screen for a bit after dying. Like even after I spawned, I still see the big tomato. (It takes a while to respawn considering the amount of death)
Lastly thanks for reading this and for your effort!!