Make a metroidvania with good combat and excellent level design. Add an elastic grappling hook as the main movement mechanic. This game is what you'd get as a result. Suffice to say, I enjoyed it very much so I can thoroughly recommend it.

Speedrunners are going to have a serious blast with this. Not just due to the movement techniques you can use to travel around as fast as possible, but also due to how many different options there are available at the player's disposal to progress through the game. The sequence-breaking capabilities are particularily fun to discover.

For instance, you might think that in order to open a door with 4 locks on it, you'd need to defeat 4 bosses so that you can get 4 keys. However, you could also just find the rocket launcher and literally propel yourself above the aforementioned door, skipping it altogether. You will even get a different ending by getting to the end without having defeated the theoretical minimum number of bosses!

Make a metroidvania with good combat and excellent level design. Add an elastic grappling hook as the main movement mechanic. This game is what you'd get as a result. Suffice to say, I enjoyed it very much so I can thoroughly recommend it. Speedrunners are going to have a serious blast with this. Not just due to the movement techniques you can use to travel around as fast as possible, but also due to how many different options there are available at the player's disposal to progress through the game. The sequence-breaking capabilities are particularily fun to discover. For instance, you might think that in order to open a door with 4 locks on it, you'd need to defeat 4 bosses so that you can get 4 keys. However, you could also just find the rocket launcher and literally propel yourself above the aforementioned door, skipping it altogether. You will even get a different ending by getting to the end without having defeated the theoretical minimum number of bosses!