ah, I see. all in all,m you can cheese most fights with archer girl by ducking close, firing shots, and rolling to the other side of the enemy ^^
I kinda figured these were just entry level bosses, but wanted to let you know anyhow.
No problem! While she has her range, she definitely has less hp than the others. The further bosses are harder to cheese since they are much faster and have more move sets. There will be 17 bosses on the final game! You should try out the other characters too! I suggest "Dark Echo"!