Well, it's a double-edged sword. Forced rebirths waste training, but on that token, training for long enough can just run straight through without the need to rebirth.
Taking out forced rebirths is a good step forward, for just a simple test. When/If you release on steam, I'd try to have more levels to play through. Higher numbers don't mean much if there's a ceiling that's easily reachable.
Overall, you have a good concept, and the framework is good, you just need to build upon it now to make it not only something that offers long term play, but also marketability so you can make money for your hard work.