First I thought the ideas of having three lives and when you lost all of them you go back to the level was a great ideas. But after playing for a while, I got really frustrated and the long gap jump on level 4/5. Where when I complete the 4 which is will take some times, I have to do the level 5 without failing to or else I get send back to 4 and needed to do the hard part again. I don't see how the slow motion is necessary after getting a tomato, for me it is a bit annoying waiting for the slow me and levels to load. Also I'm sorry I couldn't finish the game, I really tried but I'm just too frustrated.
The polish of this game on point, there particle jump/land, there are trails and there is sound effects.
I can see the background moves when the player move to mimic 3rd dimension view point. But the camera position to the platform isn't moving so it felt a bit weird since the further the object the less distance it move from one's perspective. The music fits well with the overall mood of the game so good job.
Lastly I don't see how this being well suited for the theme 'failure'. If you saying losing all your lives and dying forcing you to go back one rank count as a 'failure'. Then any game could be suited for the theme 'failure'. Darksoul you will die(fail) many time. Super meat boy you will die(fail many time). Overcook you will not reach 3 star(failure) many time. For tomatoes, you could say the goal is to get tomato and the background is tomato, but I don't see how this impact the core mechanics of the game. But I don't think this is as important as the theme.
Overall pretty polish platformer, that is very frustrating(for me).