Nice one. Btw, the space has an extra brick. Waiting for the uppercase.

It is always hard to make connections work well enough for each letter combination. Check how "s" connects to letters before and "b" to letters after, they may need some work.

t's a lot of pairs to checking, I know. We can notice you a few, but not all of them. You should pay special attention to the most common glyph combinations or pairs to get life to a pretty and usable font. If you look at how the glyphs are joined before the "t," you'll know what I mean. Go on.

It's*

Handwriting fonts are not easy. To connect the letters properly, creators add custom ligatures, sometimes hundreds of them. Those ligatures have 2-3 letters to ensure the natural flow of the script. You may find online tutorials about this topic. 

Making an educational connected script font – OpenType help and glyph setup

Creating my first connecting script font

Ask a Font Creator: Creating Connecting Script Fonts

Good luck.

The fact that FontStruct has no support for custom ligatures (well, those that don't exist as a Unicode codepoint) as of writing this doesn't help much and would require external software like FontForge, Glyphs, FontCreator, FontLab, and so on to get working correctly.

Well, you could build them in other symbols, but then it would appear as gibberish for those that dont have the font installed if you do use those ligatures in those symbols.