A colourful Metroidvania for the small purse? Monster Boy and the Cursed Kingdom is currently available for just 10 euros at (Steam) (until 7 April 2022).
In it, you set out as a young guy named Jin to put a stop to your uncle who has gone mad. He gives all the inhabitants of the kingdom an animal form. Including you – and that’s why you’ll have to cleverly combine your various guises in the course of your adventure in order to reach your goal.