I like Digimon, but this is a mediocre game at best. Gameplay is boring and too easy. After each level, you start over in your 1st form, and the digivolution time is way too long. The ending is really anticlimactic and there is no boss fight.
TIP: To DIGIVOLVE, collect the blue spheres that enemies drop, until the blue bar under your health is full. Be careful because sometimes the spheres will fall off the cliff, and you can get stuck because some areas can only be accessed after you digivolve. Collect all of the crystals to advance to the next level.