What did this game do well?

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I like how the game encourages you to spend your gems to progress through the levels (unlocking buffs/upgrades is crucial to some levels). The first level acts well as a tutorial stage and introduces you to the basic mechanisms as well as obstacles (such as the mud). The timer also forces you to try to complete the stage quickly rather than letting you strategize how to pass the stage.

I like how you can get new abilities as you continue to progress in the game.

The idea that you can buy upgrades and stuff to try and make yourself play better is really cool, and it's implemented in a really interesting way.

Collecting in-game currency to spend on a powerup in the main menu is a great idea. Especially for a game like this where it's about beating your high-scores. Very replayable concept.

I think this game actually does a great job when it comes to level design. The main mechanics are thought out and do well to compliment the level design, leading to several branching possible solutions for the player. The level design being designed in two ways depending on whether the player has purchased the power up is interesting as it allows the player to choose their own difficulty level.

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What could this game have done better?

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I think it would be cool to have the player select a limited number of buffs/upgrades when entering a level so they wont have the entire arsenals available to them. It also may help with adding variety for future level designs. As a suggestion, I also think that while going to negative numbers helps with demo, I think it might be better to implement a debug button instead so players can still get the experience of playing the game (which includes failing the level)

Sometimes I would just want to jump up the platform but I end up doing wall climb (jumping the other direction).

The debugging resources could be hidden during gameplay and accessed somehow so they're not always active

The controls are a bit wonky imo.

The use of resources in this game is a bit simple. The resources are essentially just coins to buy a power up to temporarily use on a stage. Taking a hit from an obstacle in this game doesnt have strong negative impact that losing a life may usually have, it also forces the player into a weird direction with the controls.