Size for Kids Educational App

I have a problem to discuss with you guys, please do the needful if anyone know the solution.

I am making a kids interactive app. Basically there are 52 screens full of interaction. In 1 screen there are 6-7 small piece of animations. For all the animation i use 3d softwares. we have 3d render frames of png for animation.

In each screen there are around 450 frames of animation. And my png size for each frame is 150 kb( Compressed size ) So for 52 screens there are around 23,400 frames of animations Size of png for all 23,400 frames is 3.5 GB. Now i want to know what should i do , how can i make this app with 3.5 gb file size.

Can i play videos in place of png frames, because mpeg4, h.264 compressor is making 450 frames of animation videos in 5MB. If this way works than my files size around 270 MB for all the frames.

Please give some solution for this.

Thanks Sumit