Day 5 of Playing 'Immortal Girl'

It's already been 5 days since I started playing 'Immortal Girl'... *cough* I initially thought I'd quit after a few days, but it's surprisingly addictive, so I'm still playing! (Even played during my exam period) I've tried various skills like Fire, Lightning, Light, and Hail. Personally, I find the combination of Light and Hail to be the best. Especially when enemies swarm in, there's a certain satisfaction in wiping them out all at once, you know? I've reached wave 80 currently, and it really feels like skill combinations are crucial in the later stages. I'm still experimenting with different things, but I'm enjoying it a lot. Developer, what skill combination do you personally recommend the most? (I'm genuinely so curious) (If there are any hidden OP combos, please tell me just between us...)