Phonics
I like the app and my students like it as well. However, I think the phonics should be more in line with true phgonics. The "er" sound should be a true "er" and not split into an "e" sound and an "r" sound. Placing sounds into their rightful patterns would help students not only understand the sound better but also help them with spelling.
Japanedwards about
Montessori Crosswords for Kids, v3.6